Answer: Square planar Pt(II) complexes.
- A Square planar Pt(II) complexes
- B Octahedral Co(III) as widely reported
- C Tetrahedral Ni(II) in standard practice
- D Linear Au(I) under most conditions encountered
Correct answer: A. Square planar Pt(II) complexes
Explanation: The trans effect (kinetic lability of a ligand trans to another) is most pronounced and best studied in square planar Pt(II) complexes.
The three common coordination geometries: octahedral (6 ligands), tetrahedral (4 ligands), and square planar (4 ligands in one plane).
Concept context
Study of compounds where a central metal atom is bonded to surrounding ligands. Covers nomenclature, types of isomerism, bonding theories (VBT, CFT), and applications in medicine, photography, and industry.